code: def testMultipleFiles(self):
      file_prefix = os.path.join(self._base_dir, "temp_file")
      for i in range(5000):
          with gfile.GFile(file_prefix + str(i), mode="w") as f:
              f.write("testing")
              f.flush()
  
          with gfile.GFile(file_prefix + str(i), mode="r") as f:
              self.assertEqual("testing", f.read())
  
imports: import os.path
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import compat, errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 7 for calling the FileIoTest obj's underlying member method code with example usage: obj.testMultipleFiles() without return types